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Abstract

A novel kind of highly birefringent large-mode-area optical fiber is proposed in this paper. Birefringence in the fiber is realized by the introduction of an anisotropic microstructured core. The microstuctured core is composed of down-doped silica rods embedded in the background of up-doped silica. Numerical investigations demonstrate that high birefringence on the order of 2×10-4 and hexagonal profile mode fields with mode areas larger than 300 µm2 can be achieved in the proposed fiber. The influence of doping levels on the properties of birefringence, confinement losses, and mode-areas of the fiber is also investigated. Based on the design, we also propose a novel kind of single-polarization single-mode optical fiber with a mode area of 725 µm2 and an operating wavelength range as large as 340 nm.

Figures (7)

(a) Cross-section of a microstructured-core optical fiber. The dark area denotes pure silica and the white areas represent air holes. (b) The enlarged core area. The darker area denotes pure silica, the lighter area represents up-doped silica, and the yellow area denotes down-doped silica.

(a) Effective indexes of the microstructured-core neff,core for x-polarized state (dotted curves), and y-polarized state (solid curves). The thinner curves indicate the effective indexes of the microstructured-cladding neff,clad with, from top to bottom, d/Λ=0.20, 0.30, 0.40, 0.50, and 0.60, respectively. (b) Birefringence of the microstructured core.